viahm.dll @ VIAHMGetTsens1Reg problems

Code:

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#define _WIN32_WINNT  0x0500
#define WINVER              0x0500

#include <iostream.h>
#include <Windows.h>
#include <stdio.h>

typedef int (__stdcall *viaBOOL) (void);
typedef int (__stdcall *viaVAL) (void);    //<---- Something is wrong here
 
int main()
{
        HINSTANCE hLib;
        hLib = LoadLibrary("viahm.dll");
        if(hLib) {
                viaBOOL vOpen = GetProcAddress(hLib,"VIAHMOpen");
                if(vOpen()) {
                        viaBOOL vClose, vInit = GetProcAddress(hLib,"VIAHMInit");
                        vInit();
                        viaVAL vT1Reg = GetProcAddress(hLib,"VIAHMGetTsens1Reg");
                        vT1Reg();  //<---- And here too
                        vClose = GetProcAddress(hLib,"VIAHMClose");
                        vClose();
                }
        }
        FreeLibrary(hLib);
        return(0);
}

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When I compile this I get no compiler errors, but get runtime error. I think this is related with bad data type viaVAR. I tryed (I think this is correct) something like this:

Code:

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typedef void (__stdcall *viaVAL) (PDWORD);

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but after that I get compiler error: "error C2440: 'initializing' : cannot convert from 'int (__stdcall *)(void)' to 'void (__stdcall *)(unsigned long *)'"
Thanks. Regards.

You can cast the return value of getprocaddress to match the function prototype of the procedure you are loading. (viaVAL) GetProcAddress(blahbluebleh);

> typedef int (__stdcall *viaVAL) (PDWORD);
You need to make sure it matches exactly what the real function is, in parameters and return results.

Then you say things like

Code:

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viaVAL vT1Reg = (viaVAL)GetProcAddress(hLib,"VIAHMGetTsens1Reg");
DWORD param = 0;
int result = vT1Reg( &param );

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VIAHMGetTsens1Reg isnt documented. So I dont know what parameters it takes. http://forum.ab.ru/index.php?showtop...3&#entry171973 VIAHMGetTsens1Reg : function(Val : PDWORD) : DWORD; stdcall; from here I take a guess that it return DWORD and take one unsigned long * as parameter but..... nothing is right. Dont know why.

Why are you trying to call an undoumented function?

Do you even know if it exists or not?

How do you know if you need to call other things prior to calling that function?

Hmz...I know ehre an error is. It is in VIAHMInit. It returns 0. Dont know why... So other program part is bad... :/